Communication method using network slice

A method for performing communication, the method performed by an AMF (Access and Mobility Management function) and comprising:

• receiving a registration request for a network slice from a UE (User Equipment);
• transmitting a response message to a base station,
• wherein the response message includes i) rejection for the registration request and ii) slice information, based on the network slice being not available for the UE,
• wherein the slice information includes information about frequency band and TA (Tracking Area) where the network slice is available for the UE.

A method for performing communication, the method performed by a UE (User Equipment) and comprising:

• transmitting a 1st registration request for a network slice via 1st base station to a 1st AMF (Access and Mobility Management function);
• receiving a response message from the 1st base station,
• wherein the response message includes rejection for the request,
• wherein the response message includes cell selection information which is about frequency band and TA (Tracking Area) where the network slice is available for the UE;
• reselecting a cell which supports the network slice, based on the cell selection information;
• transmitting a 2nd registration request message, via 2nd base station which serves the cell, to 2nd AMF.

A UE (User Equipment) configured to perform communication, the device comprising:

• a transceiver,
• a processor operably connectable to the transceiver,
• wherein the processer is configured to control transceiver to transmits a 1st registration request for a network slice via 1st base station to a 1st AMF (Access and Mobility Management function),
• wherein the processer is configured to control transceiver to receive a response message from the 1st base station,
• wherein the response message includes rejection for the request,
• wherein the response message includes cell selection information which is about frequency band and TA (Tracking Area) where the network slice is available for the UE,
• wherein the processer reselects a cell which supports the network slice, based on the cell selection information,
• wherein the processer is configured to control transceiver to transmits 2nd registration request message, via 2nd base station which serves the cell, to 2nd AMF.